C++ (Cpp) MCSymbolData::getFlags示例

示例#1

文件： WinCOFFObjectWriter.cpp 项目： CartBlanche/llvm

/// This function takes a section data object from the assembler
/// and creates the associated COFF symbol staging object.
void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
                                       MCAssembler &Assembler) {
  COFFSymbol *coff_symbol = GetOrCreateCOFFSymbol(&SymbolData.getSymbol());

  coff_symbol->Data.Type         = (SymbolData.getFlags() & 0x0000FFFF) >>  0;
  coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;

  if (SymbolData.getFlags() & COFF::SF_WeakExternal) {
    coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;

    if (SymbolData.getSymbol().isVariable()) {
      coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
      const MCExpr *Value = SymbolData.getSymbol().getVariableValue();

      // FIXME: This assert message isn't very good.
      assert(Value->getKind() == MCExpr::SymbolRef &&
              "Value must be a SymbolRef!");

      const MCSymbolRefExpr *SymbolRef =
        static_cast<const MCSymbolRefExpr *>(Value);
      coff_symbol->Other = GetOrCreateCOFFSymbol(&SymbolRef->getSymbol());
    } else {
      std::string WeakName = std::string(".weak.")
                           +  SymbolData.getSymbol().getName().str()
                           + ".default";
      COFFSymbol *WeakDefault = createSymbol(WeakName);
      WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
      WeakDefault->Data.StorageClass  = COFF::IMAGE_SYM_CLASS_EXTERNAL;
      WeakDefault->Data.Type          = 0;
      WeakDefault->Data.Value         = 0;
      coff_symbol->Other = WeakDefault;
    }

    // Setup the Weak External auxiliary symbol.
    coff_symbol->Aux.resize(1);
    memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
    coff_symbol->Aux[0].AuxType = ATWeakExternal;
    coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = 0;
    coff_symbol->Aux[0].Aux.WeakExternal.Characteristics =
      COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;
  }

  // If no storage class was specified in the streamer, define it here.
  if (coff_symbol->Data.StorageClass == 0) {
    bool external = SymbolData.isExternal() || (SymbolData.Fragment == NULL);

    coff_symbol->Data.StorageClass =
      external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
  }

  if (SymbolData.Fragment != NULL)
    coff_symbol->Section =
      SectionMap[&SymbolData.Fragment->getParent()->getSection()];

  // Bind internal COFF symbol to MC symbol.
  coff_symbol->MCData = &SymbolData;
  SymbolMap[&SymbolData.getSymbol()] = coff_symbol;
}

示例#2

文件： WinCOFFObjectWriter.cpp 项目： ChiahungTai/llvm

/// This function takes a section data object from the assembler
/// and creates the associated COFF symbol staging object.
void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
                                       MCAssembler &Assembler) {
  MCSymbol const &Symbol = SymbolData.getSymbol();
  COFFSymbol *coff_symbol = GetOrCreateCOFFSymbol(&Symbol);
  SymbolMap[&Symbol] = coff_symbol;

  if (SymbolData.getFlags() & COFF::SF_WeakExternal) {
    coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;

    if (Symbol.isVariable()) {
      const MCSymbolRefExpr *SymRef =
        dyn_cast<MCSymbolRefExpr>(Symbol.getVariableValue());

      if (!SymRef)
        report_fatal_error("Weak externals may only alias symbols");

      coff_symbol->Other = GetOrCreateCOFFSymbol(&SymRef->getSymbol());
    } else {
      std::string WeakName = std::string(".weak.")
                           +  Symbol.getName().str()
                           + ".default";
      COFFSymbol *WeakDefault = createSymbol(WeakName);
      WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
      WeakDefault->Data.StorageClass  = COFF::IMAGE_SYM_CLASS_EXTERNAL;
      WeakDefault->Data.Type          = 0;
      WeakDefault->Data.Value         = 0;
      coff_symbol->Other = WeakDefault;
    }

    // Setup the Weak External auxiliary symbol.
    coff_symbol->Aux.resize(1);
    memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
    coff_symbol->Aux[0].AuxType = ATWeakExternal;
    coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = 0;
    coff_symbol->Aux[0].Aux.WeakExternal.Characteristics =
      COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;

    coff_symbol->MCData = &SymbolData;
  } else {
    const MCSymbolData &ResSymData =
      Assembler.getSymbolData(Symbol.AliasedSymbol());

    coff_symbol->Data.Type         = (ResSymData.getFlags() & 0x0000FFFF) >>  0;
    coff_symbol->Data.StorageClass = (ResSymData.getFlags() & 0x00FF0000) >> 16;

    // If no storage class was specified in the streamer, define it here.
    if (coff_symbol->Data.StorageClass == 0) {
      bool external = ResSymData.isExternal() || (ResSymData.Fragment == NULL);

      coff_symbol->Data.StorageClass =
       external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
    }

    if (ResSymData.Fragment != NULL)
      coff_symbol->Section =
        SectionMap[&ResSymData.Fragment->getParent()->getSection()];

    coff_symbol->MCData = &ResSymData;
  }
}

示例#3

文件： MCELFStreamer.cpp 项目： jyasskin/llvm-mirror

static void SetBinding(MCSymbolData &SD, unsigned Binding) {
  assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
         Binding == ELF::STB_WEAK);
  uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
  SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
}